/*
 * Copyright (C) 2006-2012 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include <assert.h>
#include <stddef.h>
#include <string.h>
#include <alloca.h>
#include "intel_batchbuffer.h"
#include "i965_decoder_utils.h"
#include "i965_drv_video.h"
#include "i965_defines.h"

/* Set reference surface if backing store exists */
static inline int
set_ref_frame(
    struct i965_driver_data *i965,
    GenFrameStore           *ref_frame,
    VASurfaceID              va_surface
)
{
    struct object_surface *obj_surface;

    if (va_surface == VA_INVALID_ID)
        return 0;

    obj_surface = SURFACE(va_surface);
    if (!obj_surface || !obj_surface->bo)
        return 0;

    ref_frame->surface_id = va_surface;
    return 1;
}

/* Check wether codec layer incorrectly fills in slice_vertical_position */
int
mpeg2_wa_slice_vertical_position(
    struct decode_state           *decode_state,
    VAPictureParameterBufferMPEG2 *pic_param
)
{
    unsigned int i, j, mb_height, vpos, last_vpos = 0;

    /* Assume progressive sequence if we got a progressive frame */
    if (pic_param->picture_coding_extension.bits.progressive_frame)
        return 0;

    /* Wait for a field coded picture */
    if (pic_param->picture_coding_extension.bits.picture_structure == MPEG_FRAME)
        return -1;

    assert(decode_state && decode_state->slice_params);

    mb_height = (pic_param->vertical_size + 31) / 32;

    for (j = 0; j < decode_state->num_slice_params; j++) {
        struct buffer_store * const buffer_store =
            decode_state->slice_params[j];

        for (i = 0; i < buffer_store->num_elements; i++) {
            VASliceParameterBufferMPEG2 * const slice_param =
                ((VASliceParameterBufferMPEG2 *)buffer_store->buffer) + i;

            vpos = slice_param->slice_vertical_position;
            if (vpos >= mb_height || vpos == last_vpos + 2) {
                WARN_ONCE("codec layer incorrectly fills in MPEG-2 slice_vertical_position. Workaround applied\n");
                return 1;
            }
            last_vpos = vpos;
        }
    }
    return 0;
}

/* Build MPEG-2 reference frames array */
void
mpeg2_set_reference_surfaces(
    VADriverContextP               ctx,
    GenFrameStore                  ref_frames[MAX_GEN_REFERENCE_FRAMES],
    struct decode_state           *decode_state,
    VAPictureParameterBufferMPEG2 *pic_param
)
{
    struct i965_driver_data * const i965 = i965_driver_data(ctx);
    VASurfaceID va_surface;
    unsigned pic_structure, is_second_field, n = 0;

    pic_structure = pic_param->picture_coding_extension.bits.picture_structure;
    is_second_field = pic_structure != MPEG_FRAME &&
        !pic_param->picture_coding_extension.bits.is_first_field;

    ref_frames[0].surface_id = VA_INVALID_ID;

    /* Reference frames are indexed by frame store ID  (0:top, 1:bottom) */
    switch (pic_param->picture_coding_type) {
    case MPEG_P_PICTURE:
        if (is_second_field && pic_structure == MPEG_BOTTOM_FIELD) {
            va_surface = decode_state->current_render_target;
            n += set_ref_frame(i965, &ref_frames[n], va_surface);
        }
        va_surface = pic_param->forward_reference_picture;
        n += set_ref_frame(i965, &ref_frames[n], va_surface);
        break;

    case MPEG_B_PICTURE:
        va_surface = pic_param->forward_reference_picture;
        n += set_ref_frame(i965, &ref_frames[n], va_surface);
        va_surface = pic_param->backward_reference_picture;
        n += set_ref_frame(i965, &ref_frames[n], va_surface);
        break;
    }

    while (n != 2)
        ref_frames[n++].surface_id = ref_frames[0].surface_id;

    if (pic_param->picture_coding_extension.bits.progressive_frame)
        return;

    ref_frames[2].surface_id = VA_INVALID_ID;

    /* Bottom field pictures used as reference */
    switch (pic_param->picture_coding_type) {
    case MPEG_P_PICTURE:
        if (is_second_field && pic_structure == MPEG_TOP_FIELD) {
            va_surface = decode_state->current_render_target;
            n += set_ref_frame(i965, &ref_frames[n], va_surface);
        }
        va_surface = pic_param->forward_reference_picture;
        n += set_ref_frame(i965, &ref_frames[n], va_surface);
        break;

    case MPEG_B_PICTURE:
        va_surface = pic_param->forward_reference_picture;
        n += set_ref_frame(i965, &ref_frames[n], va_surface);
        va_surface = pic_param->backward_reference_picture;
        n += set_ref_frame(i965, &ref_frames[n], va_surface);
        break;
    }

    while (n != 4)
        ref_frames[n++].surface_id = ref_frames[2].surface_id;
}

/* Generate flat scaling matrices for H.264 decoding */
void
avc_gen_default_iq_matrix(VAIQMatrixBufferH264 *iq_matrix)
{
    /* Flat_4x4_16 */
    memset(&iq_matrix->ScalingList4x4, 16, sizeof(iq_matrix->ScalingList4x4));

    /* Flat_8x8_16 */
    memset(&iq_matrix->ScalingList8x8, 16, sizeof(iq_matrix->ScalingList8x8));
}

/* Get first macroblock bit offset for BSD, minus EPB count (AVC) */
/* XXX: slice_data_bit_offset does not account for EPB */
unsigned int
avc_get_first_mb_bit_offset(
    dri_bo                     *slice_data_bo,
    VASliceParameterBufferH264 *slice_param,
    unsigned int                mode_flag
)
{
    unsigned int slice_data_bit_offset = slice_param->slice_data_bit_offset;

    if (mode_flag == ENTROPY_CABAC)
        slice_data_bit_offset = ALIGN(slice_data_bit_offset, 0x8);
    return slice_data_bit_offset;
}

/* Get first macroblock bit offset for BSD, with EPB count (AVC) */
/* XXX: slice_data_bit_offset does not account for EPB */
unsigned int
avc_get_first_mb_bit_offset_with_epb(
    dri_bo                     *slice_data_bo,
    VASliceParameterBufferH264 *slice_param,
    unsigned int                mode_flag
)
{
    unsigned int in_slice_data_bit_offset = slice_param->slice_data_bit_offset;
    unsigned int out_slice_data_bit_offset;
    unsigned int i, n, buf_size, data_size;
    uint8_t *buf;
    int ret;

    buf_size  = slice_param->slice_data_bit_offset / 8;
    data_size = slice_param->slice_data_size - slice_param->slice_data_offset;
    if (buf_size > data_size)
        buf_size = data_size;

    buf = alloca(buf_size);
    ret = dri_bo_get_subdata(
        slice_data_bo, slice_param->slice_data_offset,
        buf_size, buf
    );
    assert(ret == 0);

    for (i = 2, n = 0; i < buf_size; i++) {
        if (!buf[i - 2] && !buf[i - 1] && buf[i] == 3)
            i += 2, n++;
    }
    out_slice_data_bit_offset = in_slice_data_bit_offset + n * 8;

    if (mode_flag == ENTROPY_CABAC)
        out_slice_data_bit_offset = ALIGN(out_slice_data_bit_offset, 0x8);
    return out_slice_data_bit_offset;
}

static inline uint8_t
get_ref_idx_state_1(const VAPictureH264 *va_pic, unsigned int frame_store_id)
{
    const unsigned int is_long_term =
        !!(va_pic->flags & VA_PICTURE_H264_LONG_TERM_REFERENCE);
    const unsigned int is_top_field =
        !!(va_pic->flags & VA_PICTURE_H264_TOP_FIELD);
    const unsigned int is_bottom_field =
        !!(va_pic->flags & VA_PICTURE_H264_BOTTOM_FIELD);

    return ((is_long_term                         << 6) |
            ((is_top_field ^ is_bottom_field ^ 1) << 5) |
            (frame_store_id                       << 1) |
            ((is_top_field ^ 1) & is_bottom_field));
}

/* Fill in Reference List Entries (Gen5+: ILK, SNB, IVB) */
void
gen5_fill_avc_ref_idx_state(
    uint8_t             state[32],
    const VAPictureH264 ref_list[32],
    unsigned int        ref_list_count,
    const GenFrameStore frame_store[MAX_GEN_REFERENCE_FRAMES]
)
{
    unsigned int i, n, frame_idx;

    for (i = 0, n = 0; i < ref_list_count; i++) {
        const VAPictureH264 * const va_pic = &ref_list[i];

        if (va_pic->flags & VA_PICTURE_H264_INVALID)
            continue;

        for (frame_idx = 0; frame_idx < MAX_GEN_REFERENCE_FRAMES; frame_idx++) {
            const GenFrameStore * const fs = &frame_store[frame_idx];
            if (fs->surface_id != VA_INVALID_ID &&
                fs->surface_id == va_pic->picture_id) {
                assert(frame_idx == fs->frame_store_id);
                break;
            }
        }
        assert(frame_idx < MAX_GEN_REFERENCE_FRAMES);
        state[n++] = get_ref_idx_state_1(va_pic, frame_idx);
    }

    for (; n < 32; n++)
        state[n] = 0xff;
}

/* Emit Reference List Entries (Gen6+: SNB, IVB) */
static void
gen6_send_avc_ref_idx_state_1(
    struct intel_batchbuffer         *batch,
    unsigned int                      list,
    const VAPictureH264              *ref_list,
    unsigned int                      ref_list_count,
    const GenFrameStore               frame_store[MAX_GEN_REFERENCE_FRAMES]
)
{
    uint8_t ref_idx_state[32];

    BEGIN_BCS_BATCH(batch, 10);
    OUT_BCS_BATCH(batch, MFX_AVC_REF_IDX_STATE | (10 - 2));
    OUT_BCS_BATCH(batch, list);
    gen5_fill_avc_ref_idx_state(
        ref_idx_state,
        ref_list, ref_list_count,
        frame_store
    );
    intel_batchbuffer_data(batch, ref_idx_state, sizeof(ref_idx_state));
    ADVANCE_BCS_BATCH(batch);
}

void
gen6_send_avc_ref_idx_state(
    struct intel_batchbuffer         *batch,
    const VASliceParameterBufferH264 *slice_param,
    const GenFrameStore               frame_store[MAX_GEN_REFERENCE_FRAMES]
)
{
    if (slice_param->slice_type == SLICE_TYPE_I ||
        slice_param->slice_type == SLICE_TYPE_SI)
        return;

    /* RefPicList0 */
    gen6_send_avc_ref_idx_state_1(
        batch, 0,
        slice_param->RefPicList0, slice_param->num_ref_idx_l0_active_minus1 + 1,
        frame_store
    );

    if (slice_param->slice_type != SLICE_TYPE_B)
        return;

    /* RefPicList1 */
    gen6_send_avc_ref_idx_state_1(
        batch, 1,
        slice_param->RefPicList1, slice_param->num_ref_idx_l1_active_minus1 + 1,
        frame_store
    );
}